Texigryphaea washitaensis (Hill, 1898)

Remarks

• Collector:   Keith Minor

• Formation: Washita Group, Georgetown Fm

• Location:    Williamson County, TX

• Ok, here are some bonafide Texigryphaea washitaensis's.

General Info

Synonyms (older names and misidentifications in the literature)

• 1898 Gryphaea washitaensis Hill

• 1901 Gryphaea washitaensis Hill; Hill

• 1910 Gryphaea pitcheri var. washitaensis Hill; Bose

• 1920 Gryphaea washitaensis Hill; Winton

• 1927 Gryphaea washitaensis Hill; Bybee & Bullard

• 1928 Gryphaea washitaensis Hill; Adkins

• 1938 Gryphaea washitaensis Hill; Jones

• 1947 Gryphaea washitaensis Hill; Shimer & Shrock

• 1947 Gryphaea washitaensis Hill; Stanton

• 1955 Gryphaea washitaensis Hill; Perkins & Albritton

• 1958 Gryphaea washitaensis Hill; Brand & DeFord

• 1959 Gryphaea (Texigryphaea) washitaensis Hill; Stenzel

• 1960 Gryphaea washitaensis Hill; Perkins

• 1967 Texigryphaea washitaensis (Hill); Hendricks

• 1971 Texigryphaea washitaensis (Hill); Stenzel

• 1989 Texigryphaea washitaensis (Hill); Kues

• 2002 Texigryphaea washitaensis (Hill); Akers & Akers

Stratigraphic Occurrence

• ? Upper Washita Group, Grayson Formation of north Texas

• Upper Washita Group, Mainstreet Limestone of north Texas

• Upper Washita Group, Pawpaw Clay of north Texas

• Lower Washita Group, Weno Limestone of north Texas

• Lower Washita Group, Denton Marl of north Texas

• Lower Washita Group, Fort Worth Limestone of north Texas

• Basal Washita Group, Duck Creek Limestone of north Texas

• Top of the Fredericksburg Group, Kiamichi Formation of north Texas

Age

• Texigryphaea washitaensis Hill is a very long ranging oyster, first appearing in the Adkinsites bravoensis (Bose) zone and disappearing either in the Graysonites lozoi Young or Budaiceras hyatti (Shattuck) zone, early Late Albian Stage to late Early Cenomanian (~101–97 mya).

Geographic Occurrence (not an all-inclusive list)

• Denton County, TX

• El Paso County, TX

• Grayson County, TX

• Tarrant County, TX

• Travis County, TX

Remarks

         For identification, see:

• Hill, R. T.  1901.  Geography and Geology of the Black and Grand Prairies, Texas with Detailed Descriptions of the Cretaceous Formations and Special Reference to Artesian Waters.  Walcott, C. D., Dir. 21st Annual Report of the United States Geological Survey to the Secretary of the Interior.  Part VII.  Texas, plate XXXVI, fig. 3.

• Hill, R. T.; Vaughan, T. W. 1898. The Lower Cretaceous Gryphaeas of the Texas Region. United States Geological Survey Bulletin 151. Washington D. C.: U. S. G. S.